<template>
  <div class="todo-footer">
    <label>
      <input type="checkbox" v-model="checkAll" />
    </label>
    <span>
      <span>已完成{{ doneTasks }}</span> / 全部{{ total }}
    </span>
    <button class="btn btn-danger" v-show="doneTasks" @click="delDone">
      清除已完成任务
    </button>
  </div>
</template>

<script>
export default {
  name: 'TodoFooter',
  props: ['todoList'],
  computed: {
    total() {
      return this.todoList.length
    },
    doneTasks() {
      return this.todoList.filter((item) => item.done).length
    },
    checkAll: {
      get() {
        return this.doneTasks === this.total && this.total !== 0
      },
      set(val) {
        this.$emit('checkAllState', val)
      },
    },
  },
  methods: {
    delDone() {
      this.$bus.$emit('delDoneTask')
    },
  },
}
</script>

<style>
/*footer*/
.todo-footer {
  height: 40px;
  line-height: 40px;
  padding-left: 6px;
  margin-top: 5px;
}

.todo-footer label {
  display: inline-block;
  margin-right: 20px;
  cursor: pointer;
}

.todo-footer label input {
  position: relative;
  top: -1px;
  vertical-align: middle;
  margin-right: 5px;
}

.todo-footer button {
  float: right;
  margin-top: 5px;
}
</style>
